Nikki's relationship with Juan Pablo is on the rocks -- literally -- in next week's episode of The Bachelor. As seen in this exclusive clip from the two-hour show, airing Monday, Feb. 7, at 8 p.m., the pediatric nurse freaks out when the Venezuelan-born former soccer pro takes her on a one-on-one date that involves rappelling down the side of a cliff.

"This is scary," she admits in a confessional, after telling Juan Pablo she's afraid of heights. "So I either live, or I die, or I poop my pants." 

"This guy is telling me, 'Right foot back. Right foot back,'" she continues. "And I'm in such a panic that I can't stop my body from shaking...I just can't. I'm just, like, frozen in fear. This is the worst moment for me -- you know, standing on the ledge, and having to make that first move."

Incidentally, Nikki isn't the first contestant this season to have anxiety about one of the date activities. In episode three of the show, Chelsie broke down in tears when Juan Pablo asked her to bungee jump off a bridge. "I'm truly terrified," she said, sobbing into his arms.

Ultimately, she made the jump -- and then celebrated with an upside-down makeout session. "I've never had a first kiss hanging upside-down off a bridge. So that is about as epic as a first kiss gets," she gushed. "I think if we can jump off a bridge together, we can pretty much get through anything."

Watch Nikki's ordeal in the clip above, and tune in to the Bachelor on Monday to see what happens next!